Material-tumbling assembly



tn ngi El R. MATERIAL TUMBLING ASSEMBLY Filed Sept. 27, 1947 Suannr Mrsjrev jfl@ EUGENE R. FRYE INVENTCW TTGR/VE Y Patented Oct. 10, 1950 MATERIAL-TUMBLING ASSEMBLY Eugene R. Frye, Akron, Ohio, assignor to The United States Stoneware Company, a corporation of Ohio Application September 27, 1947, Serial No. 776,475

This invention relates to material-tumbling assemblies such as jar mills and the like in which a cylindrical object such as a tumbling-jar is supported and rotated by a pair of cradle rolls.

Heretofore, so far as I am aware, the only provision, other than accuracy of construction, that has been employed to limit creepage of the jar or the like lengthwise of the rolls, of cylindrical form, has been the providing of the rolls with endflanges, and that expedient has been far from satisfactory because of frequent climbing of the end-flanges by the jar or the like, and because of friction of the jar or the like against the endflanges.

My chief object is to provide cradle rolls that will maintain the jar or the like in proper position by contact with it of only their supporting surfaces.

I have discovered that the jar or the like can be kept in proper position intermediate the ends of the rolls, and out of contact with the end flanges if they are presen-t, as for ornamentation, by giving one or both of the rolls such double-taper form, as hereinafter described, and by providing such drive, that the creeping of the jar, in case of displacement, will always be toward the middle position.

Of the accompanying drawings:

Fig. 1 is a diagrammatic plan view of a pair of jar-mill cradle rolls embodying my invention in its preferred form and a jar, shown in dotted lines, mounted thereon.

Fig. 2 is a section on line 2-2 of Fig. l.

Fig.` 3 is a section on line 3-3 of Fig, 1.

Fig. 4 is a diagram of the same with the tapered forms of the rolls accentuated for easy analysis of the principles involved.

Fig. 5 is a similar diagram of a modication.

Fig. 6 is a similar diagram of another modiication.

Referring to Figs. 1 to 4 of the drawings, showing the preferred embodiment, one of the rolls, l0, is of slightly waisted form in its jar-contacting portion, tapering from both ends toward the middle, and the other roll, ll, is of slightly crowned form, being tapered from its middle toward each of its ends, and it is provided with a driving trunnion or shaft I2. The taper, in each instance, can be a uniform taper, but preferably the side lines of the rolls that are tapered are arcs of circles, as illustrated in accentuated form in Figs. 4, 5 and 6.

In Fig. 4 the jar is shown as being displaced to the right of the middle position, where it finds three-point support at the positions A and B on 4 Claims. (Cl. 241-178) the concave roller and the position C on the convex roller.

The necessary direction of rotation of the jar is indicated by the arrow, and to cause it to rotate in that direction the two cradle rolls must rotate in the opposite direction, which means that the top of the crowned roll moves inward, toward the other, concave, cradle roll.

In this assembly, Figs. 1 to 4, the axis D-D` of the jar, Fig. 4, is always tangent to the curved line E-E which equally divides the space between the adjacent side lines of the cradle rolls. The jars direction of progress on the surface of each of the cradle rolls, being at right angles to its own axis, and that axis, D-D, being oblique to the axes of the cradle rolls, the jars progressvepoints of contact have with respect to both of the cradle rolls a component of movement toward theopposite endsl of the cradle rolls until the jar has moved back to middle position, at which time its axis is parallelto the axes of the cradle rolls. f

A like restoration of the jar to middle position of course occurs if the jar is displaced toward the left ends of the cradle rolls.

Thus the assembly has, by reason of the form and relationship of the parts, a directional, selfcorrecting factor.

The same corrective factors operate whether the drive is through either one or both of the cradle rolls, it being essential only that the direction of drive be such that the top of the crowned roll move inward, toward the other cradle roll.

I prefer, however, to drive the crowned roll, as indicated on the drawings, and to have the other roll driven only by the jar, so that if because of change of speed or for any other reason lthe jar starts to climb the crowned roll it will be receiving external force only in a direction toward its proper position and if it starts to climb the concave roll it will lose contact with the driving roll and cease to receive Vany force from it in the direction of its climb. Y

In Fig. 5, with the driving roll cylindrical and the driven roll concave, andthe rotations being in the directions indicated by the arrow applied to the jar, the corrective eect is provided whenever, by misplacement of the jar, its axis, (3i-G, becomes, as viewed from above, oblique to its normal axis F-F, parallel to the axis of the cradle rolls, and here, as in Fig. 4, the misplaced jar has three points of support, at the positions, A, B and C.

In Fig. 6,.with a crowned driving roll and a cylindrical idler, rotating in the proper direction, the corrective elect is present, but in this assembly, instead 0f having the more stable three-point support of Fig. 4 or Fig. 5, the jar has only rockertype, two-point support, at the positions A and B, its right end being lower than its left end and its axis, I-I being oblique to its normal axis H-H as viewed from above.

In each of these three types of assemblies, it is essential that the cradle roll whose top moves inward, toward the other cradle roll, be the one which has the greater ratio of middle diameter to end diameter. In Fig. 5, for example, that ratio is 1 to 1 in the cylindrical roll and lessl than 1 to 1 in the waisted roll, and it is the cylindrical roll whose top moves inward, toward the other roll.

Opposite direction of rotation would produce the opposite of the desired corrective effect.

Other departures from the preferred construetion of Fig. 1 are possible without sacrifice of all of the merit of the invention and without departure from its scope as dened in the appended claims.

I claim:

1. A material-tumbling assembly comprising a tumbling container 0f at least approximately cylindrical general shape in its main body portion and, for supporting and rotating said container, two cradle rolls, means whereby said rolls are mounted for rotation upon substantially parallel and substantially horizontal axes, of which rolls at least one is of gradual double-taper form substantially throughout its load-suporting portion and one has a greater ratio of middle diameter to end diameter oi said portion than the other has, the assembly including means by which the rolls can be caused to rotate in such direction that the 4 l lengthwise of the rolls, its direction of rolling travel on the surface of each of the rolls will have a component toward normal position of the container.

2. An assembly as dened in claim 1 in which one of the rolls substantially throughout it loadsupporting portion is of waisted form.

3. An assembly as defined in claim 1 in which one of the rolls substantially throughout its loadsupporting portion is of gradual waisted form and the other substantially throughout its load-supporting portion, is of gradual crowned form.

4. An assembly as defined in claim 1 in which the greater-ratio roll is a driven roll and the other is an idler roll. I

EUGENE R. FRYE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 24,765 Shaw July 12, 1859 107,184 Lister Sept. 6, 1870 178,564 Smith June 13, 1876 215,751 Hyatt May 27, 1879 245,313 O-liver Aug. 9, 1881 294,361 Bowers Mar. 4, 1884 1,017,941 Wright Feb. 2o, 1912 1,172,883 Gammeter Feb. 22, 1916 1,187,246 Bouvier June 13, 1916 1,445,488 Clark Feb. 13, 1923 1,457,084 McLaughlin May 29, 1923 1,475,693 Ferencz Nov, 27, 1923 1,867,522 Noffsinger July 12, 1932 1,940,492 Gale Dec, 19, 1933 2,211,824 Johnson Aug. 20, 1940 2,212,452 Pereny Aug. 20, 1940 

